The 2018 United Kingdom Proof Coin Set contains 5 of 2018's commemorative coins combined with the distributing coins of the year. It includes the brand-new 12-sided ₤1 coin, initially issued in 2017 and the distributing coins of 2018. The 1p to the 50p feature Matthew Dent's Shield of the Arms 'picture-puzzle' while the ₤2 coin features Britannia, designed by Antony Dufort. Each definitive coin is struck in its circulating alloy, however, they have been completed to Proof standard, highlighting every detail of the design.

The 2018 United Kingdom Proof Coin Set is completed by The Royal Mint Medal, created by Royal Mint coin designer Kerry Davies. Taking the kind of an ingot, the medal commemorates the circulating coinage of the United Kingdom.

A ₤5 coin marks His Royal Highness Prince George of Cambridge's fifth birthday. A ₤2 coin honours the 100th anniversary of the Royal Air Force. A ₤2 coin pays homage to Mary Shelley's novel Frankenstein, or The Modern Prometheus, very first published 200 years earlier. The Armistice of 1918, the initial step towards ending the horror of the First World War, is marked by a ₤2 coin. 50p coin celebrates 100 years because the death of the Representation of the People Act 1918, hailed as a landmark occasion for democracy.